JPH0122898Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Technical field of the invention The invention relates to a communicating pipe that communicates with a plurality of pipes, joins each pipe, and connects the joined pipe with the pipe of another pipe. It is.

(b) Background of the technology When an engine for a vehicle such as an automobile has a dual-type exhaust manifold, if the exhaust pipes communicating with each exhaust manifold are connected to a silencer, etc. in an independent system, there will be a There was a problem where air column resonance noise occurred.

Therefore, a communication pipe that communicates with another exhaust pipe is installed in the middle of the exhaust pipe that communicates with each exhaust manifold, and in the middle of the pipe of each exhaust pipe, the exhaust gas flowing through the other exhaust pipe is routed through the communication pipe. This method is used to prevent air column resonance from occurring in the middle of the exhaust pipe. However, when installing a communication pipe to each exhaust pipe, conventionally, a communication hole was bored in the middle of each exhaust pipe and the communication pipe was welded to each exhaust pipe. Because they are installed in a narrow space, it is difficult to assemble and weld them, and there is a need for something that can easily attach the communication pipe.

(c) Prior art and problems FIGS. 8 and 9 show the structure of a conventional communication pipe. In the figure, the ends of pipes a and b communicating with the exhaust manifold are formed into approximately semicircular shapes, and are inserted into a cylindrical communication pipe c. Also, the ends of d and e, which communicate with a muffler etc., are also formed into semicircular shapes like the pipes a and b, and are inserted into the communication pipe c. Therefore, the communication pipe c shown in FIGS. 8 and 9 can merge the exhaust gas discharged from the pipes a and b, and can divide the combined exhaust gas into the pipes d and e.

However, in the case of communicating pipe c, pipe a,
When connecting pipes b, d, and e, each pipe a, b,
The ends of d and e had to be formed into semicircular shapes.

Therefore, there is a device described in Japanese Utility Model Application Publication No. 57-150217 that allows the tubes to communicate without forming the ends of the tubes a, b, d, and e into semicircular shapes. As shown in Fig. 10, the central portions of communicating tubes f and g, each having a circular open end, are bent, and communicating holes h and i are bored in the side walls of the bent portions. The curved portions are joined, the peripheries of the communication holes h and i are welded, and the communication pipes f and g are connected.

According to the communication pipes f and g shown in Fig. 10, each opening end is formed in a circular shape, so the ends of the pipes communicating with the exhaust manifold, the silencer, etc. are shaped into semicircular shapes, etc. It is possible to connect to the communication pipes f and g without needing to form the same.

Moreover, as shown in FIG. 11, the exhaust pipes j, k
It has also been proposed that communication holes l, m are bored in the middle of the pipe, and a communication pipe n is fixed by welding to the area where the communication holes l, m are bored. If such a configuration is adopted, it is possible to connect the pipes communicating with the exhaust manifold and the pipes communicating with the muffler without machining the ends, as in the case of FIG. 10.

However, in the case shown in FIGS. 10 and 11, communication holes h, i, and communication holes l, m are deformed and drilled without burrs in the side walls of communication pipes f, g, and exhaust pipes j, k, respectively. There were problems in that it was difficult to drill the communicating holes, and it was also difficult to weld the communicating tubes f and g and weld the communicating tube n.

In addition, the system described in Japanese Utility Model Application Publication No. 56-54210 has been proposed to integrate multiple exhaust paths into one exhaust path, but in the case of this communication pipe as well, the As shown in FIG. 2, the communication pipe o is formed in a semicircular shape and is fixed at both ends, which causes problems in that it is difficult to process and the installation work is difficult.

(d) Purpose of the invention The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to provide a communicating pipe that can be easily assembled.

(e) Structure of the device In order to achieve the above object, the present invention forms at least one open end side channel of the communicating pipes in a substantially elliptical shape, and A pair of tube insertion holes are formed in the open end by crimping both oval ends of one open end of the conduit, and a space is left in the tube axis direction between the crimped open end and the oval tube is formed. Both ends of the oval side of the conduit are crimped and a branched conduit is formed in the middle of the oval conduit.

(F) Embodiment of the invention Hereinafter, a preferred embodiment of the invention will be described based on FIG.

In the communicating tube of this embodiment, first, a cylindrical tube 1, as shown in FIG. 1a, is formed into an elliptical shape, as shown in FIG. 1b. After that, as shown in FIG. 1c, both ends of the open end of the tube 1a on the oval side are crushed and both ends are crimped to form a pair of tube insertion holes 2, 3, 4, and 5 in each open end. do. When crushing each open end, the crimped open ends 6, 7
This is done in such a way that a space is left in the tube axis direction between the pipes and the branch passage 8 is formed in the middle of the pipe 1a.

The communication tube 9 formed through the processing steps shown in FIG. 1 has circular tube insertion holes 2, 3 at each opening end.
4 and 5 are formed, as shown in FIG. 2, the pipe 1 communicating with the exhaust manifold is
0, 11, and the pipe ends of the pipes 12 and 13 communicating with the muffler etc. can be connected to the communication pipe 9 without any processing. Further, since a branch line 8 is formed in the middle of the communication pipe 9, the exhaust gas introduced into the communication pipe 9 from the pipes 10 and 11 joins in the communication pipe 9, and the combined exhaust gas flows into the pipe. 12 and 13, it is possible to prevent air column resonance from occurring in the middle of the pipe of the exhaust system. Further, according to this embodiment, the pipes 10, 11, 12, 13 and the communication pipe 9
When connecting the two, the welding work is halved, making assembly work easier.

Alternatively, as shown in FIG. 3, by making a notch in the crimped open end 6, it can be directly attached to the flange 14.

Further, as shown in FIG. 4, if the communicating tube 9 is bent in the center, the tubes 10 and 11 and the tubes 12 and 13 can be easily connected at the bent portion. .

Furthermore, as shown in FIG. 5, if the opening end of the communication tube 9 on the side of the tube insertion holes 4 and 5 is drawn, the tube insertion holes 2 and 3 and the tube insertion hole 4, 5 and the pipe diameter can be changed. In this case, since the diameters of the pipes before and after the exhaust gases merge are different, the exhaust noise level can be reduced more than in the previous embodiment.

Further, as shown in FIG. 6, the central part of the communication tube 9 is kept circular, and only the open end sides of the communication tube 9 are formed into an elliptical shape, and each open end is provided with tube insertion holes 2, 3, 4,
5, the assembly work can be easily performed as in the previous embodiment.

In addition, when the exhaust paths are integrated into one exhaust path, as shown in FIG. 7, one open end of the communication pipe 9 is left circular, and the other open end side is formed into an ellipse. , both ends of the oval side of one open end of the elliptical circuit are crushed and crimped, and a space is created in the tube axis direction between the crimped open end 6 of the elliptical conduit. The two ends 14 on the other oval side are flattened, leaving the branch path 8, and the two ends 14 are crimped. In the case of this communication pipe 9, the exhaust gas that has merged via the branch passage 8 joins again on the pipe insertion hole 15 side, so that the generation of air column resonance noise can be further suppressed than in a case without the branch passage 8. I can do it.

Note that the communication pipe 9 in each of the above embodiments is an electric resistance welded steel pipe.

(g) Effects of the invention As explained above, according to the invention, at least one of the open end side pipes among the pipes is formed into a substantially elliptical shape, and the length of one open end of the elliptical pipe is Crimp both ends of the circular side to form a pair of pipe insertion tubes at the open ends, and leave a space in the tube axis direction between the crimped open ends and press both ends of the oval side of the oval conduit, Since a branch path is formed in the middle of the elliptical conduit, excellent effects can be obtained in that machining work can be easily performed and installation work can be easily performed.

[Brief explanation of the drawing]

Figures 1 a, b, and c are process diagrams of the communicating tube according to the present invention, Figure 2 is an explanatory diagram of the installation of the communicating tube according to the present invention, and Figure 3 is a configuration diagram showing a second embodiment of the present invention. ,
FIG. 4 is a configuration diagram showing the third embodiment of the present invention, and FIG.
The figure is a block diagram showing the fourth embodiment of the present invention, Fig. 6 is a block diagram showing the fifth embodiment of the present invention, Fig. 7 is a block diagram showing the sixth embodiment of the present invention, and Fig. 8 is a block diagram showing the fifth embodiment of the present invention. FIG. 9 is a sectional view taken along the line - in FIG. 8, and FIGS. 10 to 12 are configuration diagrams of another conventional communication tube. In the drawing, 2, 3, 4, 5 are tube insertion holes,
6 and 7 are open ends, 8 is a branch path, 9 is a communicating pipe, 1
0, 11, 12, and 13 indicate tubes, respectively.

Claims (1)

[Claims for Utility Model Registration] (1) In a communication pipe that communicates pipes, at least one of the pipes on the open end side is formed into a substantially elliptical shape, and one of the elliptical pipes is formed into a substantially elliptical shape. A pair of pipe insertion ports are formed at the open end by crimping the oval side ends of the open end, and a space is left in the tube axis direction between the crimped open ends and the oval side ends of the oval pipe are closed. A communicating pipe characterized in that it is formed by crimping and forming a branch path in the middle of an elliptical pipe. (2) Form each open-side conduit into an approximately elliptical shape, and form a pair of pipe insertion ports at each open end by crimping the oval side ends of each open end of each oval-shaped conduit. A communicating pipe according to claim 1 of the utility model registration claim, characterized in that it is made of: